Have fetch_file_contents() save the effective URL.

include/functions.php

@@ -11,6 +11,7 @@
 	$fetch_last_error_code = false;
 	$fetch_last_content_type = false;
 	$fetch_last_error_content = false; // curl only for the time being
+	$fetch_effective_url = false;
 	$fetch_curl_used = false;
 	$suppress_debugging = false;
 
@@ -325,6 +326,7 @@
 		global $fetch_last_error_content;
 		global $fetch_last_content_type;
 		global $fetch_last_modified;
+		global $fetch_effective_url;
 		global $fetch_curl_used;
 
 		$fetch_last_error = false;
@@ -333,6 +335,7 @@
 		$fetch_last_content_type = "";
 		$fetch_curl_used = false;
 		$fetch_last_modified = "";
+		$fetch_effective_url = "";
 
 		if (!is_array($options)) {
 
@@ -443,6 +446,8 @@
 			$http_code = curl_getinfo($ch, CURLINFO_HTTP_CODE);
 			$fetch_last_content_type = curl_getinfo($ch, CURLINFO_CONTENT_TYPE);
 
+			$fetch_effective_url = curl_getinfo($ch, CURLINFO_EFFECTIVE_URL);
+
 			$fetch_last_error_code = $http_code;
 
 			if ($http_code != 200 || $type && strpos($fetch_last_content_type, "$type") === false) {
@@ -504,6 +509,8 @@
 
 			$old_error = error_get_last();
 
+			$fetch_effective_url = $url;
+
 			$data = @file_get_contents($url, false, $context);
 
 			if (isset($http_response_header) && is_array($http_response_header)) {
@@ -519,6 +526,8 @@
 							// e.g. if we were being redirected -- last one is the right one
 						} else if ($key == 'last-modified') {
 							$fetch_last_modified = $value;
+						} else if ($key == 'location') {
+							$fetch_effective_url = $value;
 						}
 					}